<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			h1 em{
				color: aqua;
				font-family: Arial, Helvetica, sans-serif;
				font-size: 20px;
			}
			h1>strong{
				color: red;
				font-size: 30px;
			}
			h1>em>strong{
				color: green;
				text-decoration: underline;
			}
		</style>
	</head>
	<body>
		<h1>This is a<em>important</em>heading</h1>
		<p>This is a<em>important</em>paragraph</p>
		<h1>This is<strong>very</strong><strong>very</strong>important</h1>
		<h1>This is<em>really<strong>very</strong></em>important</h1>
	</body>
</html>